Burglar alarm



G. PETERSE, SR 2,149,901

BURGLAR ALARM March 7, 1939.

Filed Dec. 20, 1937 X yea/ya fezfizs'e, 67:

INVENTOR ATTORNEYS Patented Mar. 7, 1939 UNITED STATES PATENT OFFICE BURGLAR ALARM George Peterse, Sr., Englewood, N. J.

Application December 20, 1937, Serial No. 180,891

3 Claims.

This invention relates to burglar alarms generally but more particularly to a portable door operated burglar alarm.

The principal object of this invention is to provide a burglar alarm of the door-operated type which will sound an audible signal upon an attempt to open a door with which it is associated, and which will at the same time act as a wedge to prevent the Opening of the door a suflicient distance to admit a person.

Another object of this invention is to provide a burglar alarm of the above character which is constructed of few parts whereby a device of simple construction and economical manufacture is produced.

With these and other objects in View which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing:

In the drawing:

Figure 1 is a top plan view of a burglar alarm constructed in accordance with my invention,

Figure 2 is a vertical section taken on line 2-2 of Fig. 1, the signal device being shown in elevation,

Figure 3 is a top plan view of the base of the device,

Figure l is a right end view of the base, and

Figure 5 is a right end view of the wedge.

Like reference numerals designate corresponding parts throughout the several figures of the drawing.

Referring to the drawing in detail, my invention includes a base A, a signal device B, and a wedge C for actuating the signal device.

The base A consists of a relatively long and narrow sheet metal plate 5 at one end of which is formed a transverse bearing 6 in which is mounted a pivot pin 1. Downwardly extending floor-engaging prongs 8 are stamped from the plate 5 at the end thereof opposite said bearing.

The signal device B which is preferably a mechanical bell is secured to the base plate 5 adjacent the end opposite the bearing 6 and includes a horizontally reciprocable actuating element 9 which is normally extended toward said bearing.

The wedge C which is pivotally mounted upon the pivot pin 1 is formed of sheet metal and consists of a top In which inclines from the pivot towards the signal device B, side flanges II, II which extend downwardly therefrom beyond the side edges of the base plate 5 thereby forming an inverted U channel of relatively great strength, and an end piece I! which is bent downwardly from the upper end of the top I0 and thence upwardly at an inclination to form a cam I3 which overlies and contacts the element 9 of the signal device.

The lower edges of the side flanges II are nor- 5 mally maintained at an angular relationship to the floor by the support derived from contact of the cam 13 with the signal actuating element 9. The vertical height of the cam l3 above its point of contact with the element 9 is greater than the drop of the side flanges II to the floor, thereby assuring constant engagement of the cam IS with the element 9. The lower corners of the side flanges II are provided with depending floor engaging prongs M.

In operation, this device is set upon the floor with the apex of the wedge C adjacent the door sill. When an attempt is made to open the door, the lower edge of the door will engage the top 10 of the wedge and cause the wedge to swing downwardly about the pivot pin 1, thereby rendering the cam I3 effective to move the actuating element 9, and thereby operate the bell B, and at the same time the downward movement of the wedge causes the prongs Hi to engage the floor. Continued pressure on the wedge by the door will cause the prongs I4 of the wedge and the prongs 8 of the base plate to project into the floor and thereby effectively prevent additional movement of the device and the door. The limit of downward pivotal movement of the wedge is reached when the edges of the sides II move into contact with the floor, thereby effecting a solidity of structure which will not bend under door impact.

It is to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. A door operated burglar alarm comprising an elongated flat base plate to be placed on the floor and extended longitudinally adjacent to the lower edge of a door, said base plate having floor engaging prongs at its end remote from the door, a signal device mounted on said remote end portion of the base plate, said signal device having a normally projected depressible actuating element, and a channeled wedge element hingedly attached at its apex end portion to the inner end of said base plate transversely thereof, said wedge element terminating with its base end adjacent said signal device and having an end wall rebent upwardly to provide a cam portion engaging the actuating element whereby to support said wedge element in raised position, the 66 longitudinal side flanges of said wedge element straddling the base plate whereby to move into contact with the floor and support the wedge element independently of said base plate when the door is moved upon the inclined body portion of said wedge element.

2. In a door operated burglar alarm, an elongated base plate to be placed upon the floor and extended longitudinally from the adjacent lower edge of a door, said base plate having means on its underside to prevent its movement on the floor away from the door, a signal device mounted on the end portion of said base plate remote from the door and having an inwardly projecting depressible actuator element, and a channeled wedge element pivotally attached at its apex end portion to theinner end of said base plate transversely thereof, the base end of said wedge element terminating adjacent said signal device and having an inclined cam portion engaging the actuator element of said signal device whereby to hold said wedge element in normal raised position and to depress said actuator element when said wedge element is forcibly 10wered by the door moving thereon, the side flanges of said wedge element straddling said base plate and being provided with prongs on their lower edge portions whereby said wedge element is 'supported' on the floor independently of said base plate and held against endwise movement when the element is wedged under the door moved thereon.

3. The herein described door stop and alarm device, comprising an elongated sheet metal base plate to be placed on the floor and extending longitudinally from the adjacent lower edge of a door, the outer end portion of said base plate being formed with downtumed prongs to engage the floor and hold said plate against endwise movement, a signal device mounted on the outer end portion of said base plate and provided with an inwardly extending horizontal depressible actuator element, and a sheet metal wedge element of channeled cross section, the side wall portions of said wedge element adjacent its apex end being hingedly attached to the inner end portion of said base plate transversely thereof, said wedge element having prongs at the lower corners of its longitudinal side members and said side members straddling the base plate and supporting said wedge element on the floor independently of said base plate when said element is wedged under the door moved thereon, said wedge element having a wall portion at its base end rebent to form a cam extension to engage said actuator element of the signal device whereby to support said wedge element in its normal raised position and to actuate said actuator element of the signal device when said wedge element is forcibly lowered by the door moving thereon. 

